Fuente: https://www.google.com.co/imgres?imgurl=https://0701.static.prezi.com/preview/ngrqleih5ysgcca2pfrdslmamd6jc3sachvcdoaizecfr3dnitcq_0_0.png&imgrefurl=https://prezi.com/zgdkd2h80m8a/animacion/&h=160&w=269&tbnid=_eHPPDxgG0AU_M:&docid=JJ66cAekCZaR3M&ei=3vr_VuzkOsWseO3sn9gC&tbm=isch&ved=0ahUKEwjsy_KNt_DLAhVFFh4KHW32BysQMwgfKAAwAA